Worked around JavaScript bridge exception for Android 2.3. Use "prompt" instead of calling objects directly. There were several objects called from JavaScript, including BrowserKey, so key events had to be reworked.

framework/src/com/phonegap/App.java

@@ -3,7 +3,7 @@
  * MIT License (2008). See http://opensource.org/licenses/alphabetical for full text.
  * 
  * Copyright (c) 2005-2010, Nitobi Software Inc.
- * Copyright (c) 2010, IBM Corporation
+ * Copyright (c) 2010-2011, IBM Corporation
  */
 package com.phonegap;
 
@@ -17,7 +17,7 @@ import com.phonegap.api.PluginResult;
  * This class exposes methods in DroidGap that can be called from JavaScript.
  */
 public class App extends Plugin {
-	
+
     /**
      * Executes the request and returns PluginResult.
      *
@@ -45,6 +45,16 @@ public class App extends Plugin {
             }
         	else if (action.equals("addService")) {
             	this.addService(args.getString(0), args.getString(1));
+            }
+        	else if (action.equals("overrideBackbutton")) {
+            	this.overrideBackbutton(args.getBoolean(0));
+            }
+        	else if (action.equals("isBackbuttonOverridden")) {
+            	boolean b = this.isBackbuttonOverridden();
+            	return new PluginResult(status, b);
+            }
+        	else if (action.equals("exitApp")) {
+            	this.exitApp();
             }
             return new PluginResult(status, result);
         } catch (JSONException e) {
@@ -132,4 +142,32 @@ public class App extends Plugin {
     public void addService(String serviceType, String className) {
     	this.ctx.addService(serviceType, className);
     }
+    
+    /**
+     * Override the default behavior of the Android back button.
+     * If overridden, when the back button is pressed, the "backKeyDown" JavaScript event will be fired.
+     * 
+     * @param override		T=override, F=cancel override
+     */
+    public void overrideBackbutton(boolean override) {
+    	System.out.println("WARNING: Back Button Default Behaviour will be overridden.  The backbutton event will be fired!");
+    	((DroidGap)this.ctx).bound = override;
+    }
+
+    /**
+     * Return whether the Android back button is overridden by the user.
+     * 
+     * @return boolean
+     */
+    public boolean isBackbuttonOverridden() {
+    	return ((DroidGap)this.ctx).bound;
+    }
+
+    /**
+     * Exit the Android application.
+     */
+    public void exitApp() {
+    	((DroidGap)this.ctx).finish();
+    }
+
 }

framework/src/com/phonegap/BrowserKey.java

@@ -1,51 +0,0 @@
-/*
- * PhoneGap is available under *either* the terms of the modified BSD license *or* the
- * MIT License (2008). See http://opensource.org/licenses/alphabetical for full text.
- * 
- * Copyright (c) 2005-2010, Nitobi Software Inc.
- */
-package com.phonegap;
-
-import android.app.Activity;
-import android.util.Log;
-import android.webkit.WebView;
-
-/*
- * This class literally exists to protect DroidGap from Javascript directly.
- * 
- * 
- */
-
-public class BrowserKey {
-
-	DroidGap mAction;
-	boolean bound;
-	WebView mView;
-	
-	BrowserKey(WebView view, DroidGap action)
-	{
-		bound = false;
-		mAction = action;
-	}
-	
-	public void override()
-	{
-		Log.d("PhoneGap", "WARNING: Back Button Default Behaviour will be overridden.  The backKeyDown event will be fired!");
-		bound = true;
-	}
-	
-	public boolean isBound()
-	{
-		return bound;
-	}
-	
-	public void reset()
-	{
-		bound = false;
-	}
-	
-	public void exitApp()
-	{
-		mAction.finish();
-	}
-}

framework/src/com/phonegap/CallbackServer.java

@@ -69,7 +69,7 @@ public class CallbackServer implements Runnable {
 	/**
 	 * Indicates that polling should be used instead of XHR.
 	 */
-	private boolean usePolling;
+	private boolean usePolling = true;
 	
 	/**
 	 * Security token to prevent other apps from accessing this callback server via XHR

framework/src/com/phonegap/DroidGap.java

@@ -3,11 +3,12 @@
  * MIT License (2008). See http://opensource.org/licenses/alphabetical for full text.
  * 
  * Copyright (c) 2005-2010, Nitobi Software Inc.
- * Copyright (c) 2010, IBM Corporation
+ * Copyright (c) 2010-2011, IBM Corporation
  */
 package com.phonegap;
 
 import org.json.JSONArray;
+import org.json.JSONException;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -26,6 +27,7 @@ import android.view.Window;
 import android.view.WindowManager;
 import android.webkit.JsResult;
 import android.webkit.WebChromeClient;
+import android.webkit.JsPromptResult;
 import android.webkit.WebSettings;
 import android.webkit.WebStorage;
 import android.webkit.WebView;
@@ -110,7 +112,7 @@ public class DroidGap extends PhonegapActivity {
 	protected WebViewClient webViewClient;
 
 	private LinearLayout root;
-	private BrowserKey mKey;
+	boolean bound = false;
 	public CallbackServer callbackServer;
 	protected PluginManager pluginManager;
 	protected boolean cancelLoadUrl = false;
@@ -267,12 +269,6 @@ public class DroidGap extends PhonegapActivity {
 	private void bindBrowser(WebView appView) {
 		this.callbackServer = new CallbackServer();
 		this.pluginManager = new PluginManager(appView, this);
-		this.mKey = new BrowserKey(appView, this);
-
-		// This creates the new javascript interfaces for PhoneGap
-		appView.addJavascriptInterface(this.pluginManager, "PluginManager");
-		appView.addJavascriptInterface(this.mKey, "BackButton");
-		appView.addJavascriptInterface(this.callbackServer, "CallbackServer");
 
 		this.addService("App", "com.phonegap.App");
 		this.addService("Geolocation", "com.phonegap.GeoBroker");
@@ -659,10 +655,6 @@ public class DroidGap extends PhonegapActivity {
     	// Load blank page so that JavaScript onunload is called
        	this.appView.loadUrl("about:blank");
     	    	
-    	// Clean up objects
-    	if (this.mKey != null) {
-    	}
-    	
         // Forward to plugins
         this.pluginManager.onDestroy();
 
@@ -764,6 +756,69 @@ public class DroidGap extends PhonegapActivity {
             return true;
         }
 
+        /**
+         * Tell the client to display a prompt dialog to the user. 
+         * If the client returns true, WebView will assume that the client will 
+         * handle the prompt dialog and call the appropriate JsPromptResult method.
+         * 
+         * @param view
+         * @param url
+         * @param message
+         * @param defaultValue
+         * @param result
+         */
+        @Override
+        public boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) {
+			
+        	// Calling PluginManager.exec() to call a native service using 
+        	// prompt(this.stringify(args), "gap:"+this.stringify([service, action, callbackId, true]));
+        	if (defaultValue.substring(0, 4).equals("gap:")) {
+        		JSONArray array;
+        		try {
+        			array = new JSONArray(defaultValue.substring(4));
+        			String service = array.getString(0);
+        			String action = array.getString(1);
+        			String callbackId = array.getString(2);
+        			boolean async = array.getBoolean(3);
+        			String r = pluginManager.exec(service, action, callbackId, message, async);
+        			result.confirm(r);
+        		} catch (JSONException e) {
+        			e.printStackTrace();
+        		}
+        	}
+        	
+        	// Polling for JavaScript messages 
+        	else if (defaultValue.equals("gap_poll:")) {
+        		String r = callbackServer.getJavascript();
+        		result.confirm(r);
+        	}
+        	
+        	// Calling into CallbackServer
+        	else if (defaultValue.equals("gap_callbackServer:")) {
+        		String r = "";
+        		if (message.equals("usePolling")) {
+        			r = ""+callbackServer.usePolling();
+        		}
+        		else if (message.equals("restartServer")) {
+        			callbackServer.restartServer();
+        		}
+        		else if (message.equals("getPort")) {
+        			r = Integer.toString(callbackServer.getPort());
+        		}
+        		else if (message.equals("getToken")) {
+        			r = callbackServer.getToken();
+        		}
+        		result.confirm(r);
+        	}
+        	
+        	// Show dialog
+        	else {
+        		//@TODO:
+        		result.confirm("");
+        	}
+        	return true;
+        }
+
     }
 
     /**
@@ -1016,8 +1071,8 @@ public class DroidGap extends PhonegapActivity {
     	if (keyCode == KeyEvent.KEYCODE_BACK) {
 
     		// If back key is bound, then send event to JavaScript
-    		if (mKey.isBound()) {
-    			this.appView.loadUrl("javascript:document.keyEvent.backTrigger()");
+    		if (this.bound) {
+    			this.appView.loadUrl("javascript:PhoneGap.fireEvent('backbutton');");
     		}
 
     		// If not bound
@@ -1037,12 +1092,12 @@ public class DroidGap extends PhonegapActivity {
 
     	// If menu key
     	else if (keyCode == KeyEvent.KEYCODE_MENU) {
-    		appView.loadUrl("javascript:keyEvent.menuTrigger()");
+    		this.appView.loadUrl("javascript:PhoneGap.fireEvent('menubutton');");
     	}
 
     	// If search key
     	else if (keyCode == KeyEvent.KEYCODE_SEARCH) {
-    		appView.loadUrl("javascript:keyEvent.searchTrigger()");
+    		this.appView.loadUrl("javascript:PhoneGap.fireEvent('searchbutton');");
     	}
 
     	return false;